Fire-tube boiler.



No. 743,825. I PATENTED NOVTTO, T903.

P. BURGER & H. M. WILLIAMS.

FIRE TUBE BOILER.

APPLICATION FILED FEB. 20. 1903.

2-SHEETSSHEBT 1.

5'0 MODEL.

avwantw:

NO. 743,825. PATENTED Nov; 10, 1903 P. BURGER (5H; M. WILLIAMS:

FIRE TUBE BOILER.

APPLICATION FILED FEB. 20. 1903.

N0 MODEL. I 2 SHEETS-SHBET 2 a? I i rr. '7es,e25. V llmrnn drains Patented November 0,- lees.

PATENT cranes.

" rnnnzfeunonnnnn HENRY MQWILLIAMS, or rear wsrnn, INDIANA;

SAID BURGER 'sssrenon or ONE-HALF or HIS RIGHT To sAn) wiL- 1 LIAMS.

. smart-ifs aortas.

SPEGIFIGA'HQN forming n of Letters Patent No. 743,825, dated November 10, 1903. I

7 Application filed February 20, 19ll3- Serial Ho. 144,258. (No model.)

To all whom iii-inlay concern.- I

' -'Beit known that we, FRANZ BURGER. and

HENRY M. WILLIAMS, citizens of the United States, residing at Fort Wayne, Allen county, State of Indiana, have invented certain new 7 and useful Improvements I in Furnaces for 'Fire Ilube Boilers, of which the following is a specification.

f This invention relates tofnrnaees for-fireio tube boilers, and particularly to such as use a'powerful induced draft, as in locomotives. It is well known that when the exhauststeam is employed to induce a draft through the furnace the suction through thefire-tubes is often 'suliicient to draw pieces of burning fuel from the furnace through the fire-tubes and discharge them from the stack, and these pieces of burning fuel are frequently the cause of serious fires along the railway.

In addition to this objection the gasesand other products of combustion are. sucked so quickly through' the lire-tubes that they do not have snficient time to impart their heat to the tubes, and there is therefore a great 2 Waste of heat.

The object of our present invention is to prevent almost, if not entirely, the discharge or sparks and cindcr's from the stack and also j to utilize to a greater-extent the heat of the goproducts of combustion, v I

The invention willbe fully described hereinafter, reference being had to the accompa- .nying drzji-vings, in Which- Figure l is a sectional side elevation furnace and part of a fire-tube boiler enibodying our invention. Fig. 2 is a vertical transverse section with the water-tube bridge partly broken away. Fig. 3 is a similar View with the water-tube apron partly broken 0 away. Fig. 4 is a sectional detail view of a -portion of the superheater. v

Thefurnace or fire-box is indicated by 1, and it is provided with grate' bars'o, extendmg to nearly its inner end, the space between the rear grate-bar and the tube-sheet 20.,

a which formisthe rear wall of the furnace, be ing closed or-oridged by a hinged plate 19. In close proximity to the rear grate-bar is a header 4, which is connectedby nipples 6' 5o the side walls-of the furnace, and this of the boiler.

header co mmu nicates with the side water legs Another header 3 is connected to the-header 4 by a series .of water-tubes 2, and a series of water-circulating pipes 8 lead upward from the header 3 to the crown sheet 9 of the furnace, to which they are connected by nipples 10, and these pipes 8 cominunicate with the water-space of the boiler, and

the water in the boiler'can thus circulate. through the headers 4 and 3, tubes 2, and pipes 8. V r f 1.5 The header 3 is located in advance ofthe the header 4, so that the tubes Jincl'ine toward the front of the furnace. In order to bring the tubes 2 close together, their endsare reduced in diameter and fit in openings in the headers 3 and 4. The headers 3 and land tubes 2 form a bridge over which the products of combustionrnust pass on their way to the fire-tubes, and the space between the top of the bridge and the crown-sheetmay he more or less than what is shown as preferred I Depending from the crown-sheet of the fur nace ashort distance in advance of the linesheet isan apron the lower end of which is about on a level with or slightly below the lower fire-tnbes-, and the products of combus tion which pass'over thewater-tube bridge must pass down and under the apronbefore. they can enter the fire'tubes; 7 8e The apron may-bevariously constructed; but preferably it consists of lower and upper headers 13 and 14, connected by nipples 15 and 16 with the sides of the furnace and communicating with the water-space ofthe boiler, and a series of tubes 12 connect the headers, and the water in the boiler cancirculate through these headers and tubes. The upper 7' header l lfits snugly against-the crown-sheet.

-tubes 23, each havinga flange 24,-and these V flanges aresecured tothecrown sheetl), openlugs beingformed in the latter whichregister with the tubes 23, and the latter communicate with the interihrlefi the header 22. .Th s mo header is also provided with a partition 25, which divides it into two chambers, and the tubes 23 lead, respectively; from these chain"- hers. A pipe 26 within the boiler is provided with a flange 27, which is secu red to the crownsheet 9 and registers with one of ,thetubes The other end of the pipe 26 terminates in the steam-space of the bcilefl Another pipe 28 is provided with aflang'e' 29 at'o'ne end, which is secured to the crown-sheet; so that the pipe 28-registers with the other tube 23, and this pipe 28 will lead to the engine (not shown) and be provided with a suitable valve (not shown) for controlling the How of steam to the engine.

The spaces between the sides of the furnace and the sides of the water-tube bridge will be filled in by lire-brick, as indicated by 11 in Fig. 2, and the spaces between the sides of the water-tube apron and the sides of the furnace will be filled in by fire-brick 17, as indicated by 17 in Fig. 3.-

S'uch being' the preferred construction the operation willbe as follows: The products of combustion will pass over the top of the water-tubebridge-and' be intercepted by the depending water-tube apron, which will deflect them downwardlypand they will pass under the lower endoij the apron and-into thefiretubes. Any 'nipders that may by a strong induced draftbe carried from thefnrance over the bridge will strike against thegapren 5 and'drop down onto the hingedblztte 19, which" products of heating the water circulating apron.

can. be Jpened to discharge them whenever necessary. Inpassing down the apron the combustion will impart some of their heat thereto, and thereby greatly aid in through the They will also impart some of their heat to the steam-supcrheater. Without limiting ourselves to the precise construction and arrangement shown and de scribed, we claiml. The combination with the furnace of a fire-tube boiler, of a bridge extending transversely of the furnace, said bridge consisting of the furnace and communicating with the side water-legs of the furnace, an-"u per header and closely arranged tubes connectin g said headers,and,scparated tribes leading from the upper headerand-connected to the crown-sheet of the boilenand communicating-i,

with the water-space of the 'boiler, substantially as set forth. l

2. The combination with fire-tube boiler, of abridge extending transversely of the furnace from the grate-bars upwardly to leave a space between its upper edge and the crown-sheet of the furnace and between it and the fire-tubes, a water-tube apron extending from the crown-sheet downwardly into the space between the bridge and the fire-tubes, said apron comprising upper and lower headers each supported by the sidewalls of the furnace and communicating with the side water-legs, and a series of closelyarranged tubes connecting said headers, sub stantially as set forth.

3. The combination with the furnace of a fire-tube boiler, of a bridge extending transver'sely of the furnace from the grate-bars upwardly to leave a space between its upper edge and the crown-sheet of the furnace and between it and the fire-tubes, a water-tube- *steam superheater supported directly in rearthe furnace-of a v oi the Water-apron, and connections between "the superheater and the steam -spaee of the boiler, substantially as set forth.

l n testimony whereof we have signed our,

names to this specification in the presence of two subscribing witnesses.

' FRANZ BURGER.

HENRY M. WILLIAMS.-

Witnesses? N Geo-K. TQRRENCE,

of a lower header supported by the side walls Gnbnsn S. MILLER. 

